I actually didn't realize they marketed those hones specifically towards shotguns.
But in any case they will leave more of a homogenous, smooth, shiny finish than a reamer. A reamer will leave a duller finish with visible toolmarks, albeit slight ones.
The nice thing about a ball/flex hone is you can 'creep up' on the finished dimension more easily. With a reamer you're moving up in more definite increments.
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